private void momentoToolStripMenuItem_Click(object sender, EventArgs e)
{
if (img == null) // verify if the image is already opened
{
return;
}
Cursor = Cursors.WaitCursor; // clock cursor
//copy Undo Image
imgUndo = img.Copy();
MIplImage s = imgUndo.MIplImage;
ImageClass.Momento(img);
ImageViewer.Image = img.Bitmap;
ImageViewer.Refresh(); // refresh image on the screen
Cursor = Cursors.Default; // normal cursor
}